Which of the following is a key benefit of IPv6 over IPv4? 

IPv6 was developed to address the exhaustion of IPv4 addresses by providing a much larger address space. IPv4 uses a 32-bit addressing system, which allows for about 4.3 billion unique addresses. In contrast, IPv6 uses a 128-bit address, allowing for approximately 340 undecillion unique IP addresses. This massive increase ensures that IPv6 can accommodate the growing number of internet-connected devices, particularly as the Internet of Things (IoT) expands. Additionally, IPv6 eliminates the need for NAT in most cases by offering more public IP addresses. Why other options are wrong: a) IPv6 uses shorter IP addresses, making it more efficient : IPv6 addresses are actually longer (128 bits) compared to IPv4 (32 bits). b) IPv6 provides built-in support for NAT : NAT is not needed in IPv6 because the address space is vast enough to assign public addresses to all devices. c) IPv6 eliminates the need for IP address subnetting : Subnetting is still used in IPv6, although it is more flexible than in IPv4. e) IPv6 improves performance in wireless networks : While IPv6 brings some performance enhancements, it is not specifically optimized for wireless networks.